A system as in claim 1, the turbine flowmeter means including:Ī flowmeter body having a passage therethrough and a turbine having at least three blades disposed at least partially within the passage for rotation as fluid whose flow rate is to be measured impinges on the vanes Second digital latch means associated with the servo amplifier means for holding a digital value corresponding to a desired magnitude of the electrical input command signal specified by the microprocessor andĪ common bus providing a multiple conductor signal pathway between the first digital latch means, the second digital latch means and the microprocessor.Ĥ. A system as in claim 2, further comprising:įirst digital latch means associated with the flowmeter means for holding each successive value corresponding to each sensed hydraulic fluid flow rate until the microprocessor has acquired same A system as in claim 1, wherein the digital electronic control means includes at least one microprocessor supervising the overall operation of the system in the automatic test mode, and one memory means for storing a computer program specifying a sequence of steps to be carried out in a predetermined order in the automatic test mode.ģ. Servo amplifier means for producing the electrical input command signal Ĭonnection means for supplying the command signal to the servo valve andĭigital electronic control means for controlling the overall operation of the system in the automatic test mode, which attempts to cycle the servo valve at least once through substantially its full nominal range of operation by automatically varying the input command signal over a significant range of possible input command signal values for the servo valve being tested.Ģ. Means for accepting operator input commands which specify at least one test parameter and initiate the automatic test mode Turbine flowmeter means for accurately sensing hydraulic fluid flow rate over substantially the full dynamic range of the servo valve being tested Means for making hydraulic connections to the servo valve being tested A system for testing the operation of an electrohydraulic servo valve, operable in a fully automatic test mode, by applying an electrical input command signal to the servo valve and monitoring the hydraulic performance of the servo valve in response thereto, the system comprising: Preferred methods for operating this servo valve analyzing system are also disclosed.ġ. Thus, the test results indicate whether the servo valve is operating properly or needs re-calibration or repair. This input signal is preferably varied automatically in a manner that puts the valve through a test cycle including its full range of operation. An optional x-y plotter which may be housed in another suitcase is used in the automatic mode to produce a hard copy of the test results showing the hydraulic flow rate through the servo valve as a function of DC current signal that varies with time and is supplied as an input signal to the valve. Hydraulic flow is measured by digitally timing the periods between detection of the successive rotating vanes of the turbine, and compensating for nonlinearities in turbine rotation rate at low flows. Most of the system is housed in a single small portable aluminum suitcase. ![]() The system also includes: a hydraulic manifold block and an adapter block for receiving different servo valve a servo amplifier and electrical hook-up to the servo valve pressure gages and hydraulic shut-off valves a keypad for entering operating input commands and values two digital displays indicating the current supplied to the valve and the resulting hydraulic flow rate through the valve, and a special turbine flowmeter capable of highly accurate operation of at least three orders of magnitude of flow rates. A portable electrohydraulic servo valve analyzer, which has microprocessor-based electronic controller and is operable in a fully automatic mode and a manual mode, is disclosed.
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